Romans 9:27 Esaias also crieth concerning Israel, Though the number of the children of Israel be as the sand of the sea, a remnant shall be saved:
Nothing defines the size of a remnant. Once in Isaiah the remnant was called small but even then, the size was not defined. If we go back to first use issues to help us understand how God intends a word to be understood, it was in Exodus 26:12 in which the curtains of the tabernacle were being cut to a pattern. The remnant was that portion that did not fit the pattern. It was to be hung on the backside of the tabernacle. Make of that what you will.
If I were to purchase a whole bolt of cloth some twenty-five yards in length and by design or pattern, cut out a nine inch square in the corner to make a handkerchief, the rest of the bolt would then be called a remnant. Size does not matter. The excess that is not used to complete the pattern, is a remnant.
1 Peter 2:9 But ye are a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light;
A peculiar people, those who do not fit the pattern, excess, remnant, size undetermined yet designated to serve a purpose, to hang on the backside of the tabernacle.
We really should reshape our thinking about the word remnant and stop thinking of it as a small useless thing.